Spiral indicator.



J. R. S. BLAINE.

SPIRAL INDIQATOR. APPLICATION FILED mura, 1910.

1,033,866.. Patented July 30, 1912.

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IIITED STATES PATENT FFIGE.

JOSEPH It. s. BLAINE, OF eELoI'r, WISCONSIN, ASSIGNONTO -TIIE BERLINMACHINE WORKS, 0F BELOIT, WISCONSIN, A CORPORATION OF WISCONSIN.

' SPIRAI. INDICATOR:

Specification of Letters Patent.

Patented July 3o, 1912.

Application Ied July-5, 1910. Serial No. 570,332.

To all whom it my concern.'

Be it known that I, JOSEPH R. S. BLAINE, a citizen of the United States,residing at Beloit, in the countyof Rock and State of lViscOnsin, have`invented certain new and useful Improvements in Spiral Indicators, ofwhich the following is a Specification.

My inventionv has for its object the construction and production of agraduated indicator or device'of similar character which will be capableof indicating fine and minute gradations, but which at the same timewill occupy but small Space and will be composed of comparatively fewparts.;

Heretofore 1n order to have an indicator capable of registering smallmovements of parts it has been necessary to make vthe de vice ofconsiderable size. -.This objecti'on` ablevfeature is overcome in myimproved construction by dividing the graduated scale into two parts, aswill be readily understood from the following detailed description of ainvention.

In the accompanying drawings, which form a part of thisspeciiicatiom-Figure 1 is a face viewvof Oneof'my improved forms orStyles of indicators; and Fig. 2 is a section through. the same on line2-2 of 1, the parts being view ed in the direction indicated by thearrows. Referring tothe drawings, it may be ex'- plained that the rotaryshaft 5 is the part preferred and desirable embodiment of the.

which it is desired to move given and defi` nite amounts, an indicatorof this character being of particular use in the Set works of saw-mills,but, as will be readily appreciated, its employment is in no wiselimited'to restricted to such use. Fastened to the end of this shaft bymeans of a key 6 is an arm 7 by means of whichthe shaft is turned. Sucharm is provided with a longitudinal slot 8 extended therethroughand-positioned substantially-radially with respect to shaft 5. Thisslot, which has Aiiat` sides, accommodates 'a movable indicator or block9 having sethe block below the arm 7 being somewhat enlarged to preventthe block from leaving posite zero, the

` its receiving slot 8. The lower or inner reduced' end. 13 of the blockfits in a spiral groove 14 out or provided inthe face of a stationarymember 15 supplied around its circular' periphery with a plurality ofnotches 16.- As is clearly shown, this groove of Hat spiral formencircles the shaft 5, whereby when the arm 7 is turned around the axisof shaft 5 the indicator 11 is. caused to travel outwardly or inwardlyof the slot 8 alongthe scale '12, depending upon the direction ofrotationv of the arm. The groove 14 and the scale 12 are so arrangedthat one complete revolution of the arm will occa sion a movement of thepointer from one nu meral tothe next, for instance, from zero to 1.

For a planer Set works numerals 1, 2, 3,

and L.tof the scale 12 on arm 7 ordinarily indicate inches; 'On a screw17 extended 'through the outer end of arm 7 I pivot a pawl or dog '18pressed inwardly toward shaft 5 .by a suitable spring 19, in thevpresent instancea leaf-spring-,.such pawl. being also equipped with ahandle 20 near its free end. AS I have indicated in Fig. 1', the end ofsuch pawlor dog is intended and adapted to drop into the various notches16 and hold the arm 7 in the desired posit-ion and against unintentionalmovement. rlfhe member 15 is circularly `graduated at 21, in Athepresent instance in fractions of an inch, and since each eighth of. aninch as represented on V.this round scale is provided with four notches,each notch, therefore, represents 31g of an inch.

The actuation and manipulation of this indicatorfis substantially as`follows: Asx suming that the index vor pointer 11 is oppawl 18 must alsobe in the notch 0 of the Scale 21, lotherwise the inch index 11 couldnot be exactly opposite the zero ofits Scale 12. If it is desired torotate the shaft 5 an amount suflicient to occasion the sawing of boardsor planks of 25/8 linch thickness, the operator grasps the handle 20 andswings arm 7 and the' attached pawl 18 in a' clock-wise direction untilthe arm 7 has made not only two complete revolutions but` also a part ofan addi? tional revolution until the pawl drops into the notchcharacterized The main pointer 11 under these circumstances will bebetween the figures2and 3,showing that the mechanism has been set to cutboards of' more than: 2 inch thickness, the excess over. 2 inchesbelngindicated on the circular-scale 'i 21 bythe graduation It should,therefore, be perfectly clear that the indication on scale y12 bymeansof pointer 11 represents Wholel inches, the additional fractions of aninchl being indicated by the paivl 18 Von the lcircular scale 21. Inturning the arm 7 in a,

.two. scales are for inches and fractions of an inch, .the invention is'in no Wise'limited to such graduation, nor 'is the'invention restrictedto the precise .and eXact'details. ot'

. construction shown and described, because these may be modified withinwideflimits 25' invention and Without the sacrice 'of any Withoutdeparture from the substance of the substantial benei-ts and advantages.Te

those skilled in this art it Willbe lapparent .-that the object soughtisattained in aconstructionof this kind vin that the indicator Ahereinsetforth provides forjne gradua tions and yet the device is quite'compactand lsimple in-constru'ction. I tshould` also be noted that, lifdesirable or feasible, the arm 7 may be stationary and the member 15rotatable with the shaft.

`movement of the shaft on their `corresponding scales. 3 l l .I claim Ina device of the character described,

In either instance the pointer 11 and paWl 18 Will indicate the thecombination of a circularly-graduated notched stationary member having aspiral groove, a longjtudinally-graduated` slotted i -rotary member,a'paWl on said rotary member, adapted to co-act with the notches'of saidstationary member, and an'indeX block in said slot cooperating Witlisaid groove and the 4graduations of said rotaryl member, whereby theextent of rotation of said rotary member is indicated by said indexblock on the graduations ot' said rotary member 'and byI said pawl onvthecircular graduatlons of said stationary member, substan.

tially as described. i.

l JOSEPH n. s. BLAINE, l

Witnesses:

, F. A. HORSTMANN,

TILLA SoLIEN.

